Regioselective Preparation of 1-(Bromomethyl)-5H-thiazolo[3,2-a]quinazolin-5-ones and Analogous 5H-Thieno[3,2-e]thiazolo[3,2-a]pyrimidin-5-ones from Fused 2-(Alkenylthio)pyrimidin-4-ones
作者:Petra Wippich、Michael Gütschow、Siegfried Leistner
DOI:10.1055/s-2000-6390
日期:——
A convenient procedure for the regioselective preparation of polycyclic angular thiazolo[3,2-a]pyrimidin-5-ones is reported. 2-(Alkenylthio)quinazolin-4(3H)-ones and analogues thieno[2,3-d]pyrimidines were treated with bromine in acetic acid to obtain 1-(bromomethyl)-5H-thiazolo[3,2-a]quinazolin-5-ones 8a,d, and 1-(bromomethyl)-5H-thieno[3,2-e]thiazolo[3,2-a]pyrimidin-5-ones 8b,c,e,f, respectively. A route starting from 2-(alkenylamino)benzamides, which were converted to corresponding 2-thioxoquinazolin-4-ones and subsequently treated with bromine in acetic acid furnished angular 2-(bromomethyl)thiazolo[3,2-a]quinazolin-5-ones 11, or 3-(bromomethyl)[1,3]thiazino[3,2-a]quinazolin-6-ones 14, respectively.
报道了一种方便的区域选择性制备多环角
噻唑并[3,2-a]
嘧啶-5-酮的方法。 2-(烯
硫基)
喹唑啉-4(3H)-酮及其类似物
噻吩并[2,3-d]
嘧啶在
乙酸中用
溴处理得到1-(
溴甲基)-5H-
噻唑并[3,2-a]
喹唑啉分别为-5-酮8a、d和1-(
溴甲基)-5H-
噻吩并[3,2-e]
噻唑并[3,2-a]
嘧啶-5-酮8b、c、e、f。从 2-(烯基
氨基)苯甲酰胺开始,将其转化为相应的 2-
硫代
喹唑啉-4-酮,随后用
乙酸中的
溴处理,得到有角 2-(
溴甲基)
噻唑并[3,2-a]
喹唑啉-5-分别为 11 或 3-(
溴甲基)[1,3]
噻嗪[3,2-a]
喹唑啉-6-酮 14。